S32K312 - DMA major loop destination address writing problem.

[BRK_Y]

Hi,

I am trying to read 6 adc channels with DMA in  s32k312. That's why I use BCTU. BCTU makes DMA configurations automatically, but I manually change the major loop counter to 10. I allow new ADC readings by reopening the DMA hw request within the DMA loop major interrupt. My problem is this: The buffer I gave in the first DMA interrupt is filled with 60 values ​​(6 channels x 10 major loops count) as it should be. However, the second interrupt fills the buffer with 66 values.

[PetrS]

Hi,

handled in https://community.nxp.com/t5/S32K/S32K312-ADC-BCTU-with-DMA-major-loop-destination-address-writing/m...

BR, Petr

[BRK_Y]

To understand the reason, I reset the DMA buffer in each interrupt and checked it with debug. The first interrupt is ok.

[BRK_Y]

Second, starting from the 48th element, values ​​are written to the buffer by shifting 6 elements.

[BRK_Y]

Others, 54 values ​​in the buffer. I think written to same destination address in two major loops.

[BRK_Y]

Others, 54 values ​​are written to the buffer. Ithink values ​​are written to the same destination address in the two major loops.

[BRK_Y]

This problem occurs when the major loop counter is set to any value other than 1. Shouldn't we change the configurations when used with BCTU? If we can change it, which configuration should I change in addition to the major loop counter to get rid of this error?